Here is the full list of all 59 The Talos Principle 2 achievements. It takes around 40-50 hours to unlock all of the achievements on Windows.
Make a choice that will define the future.
Go above and beyond to change the future.
Defy death.
Solve all puzzles and monuments.
Find every manifestation of the past.
Find 10 ancient human artifacts.
Solve "Seesaw" puzzle by picking up only one connector.
Help Byron get elected mayor.
Discover a vision of things to come.
Activate the tower on the High Plain.
Solve all regular puzzles.
Collect all 12 of Lifthrasir's audio logs.
Explore all of the lost labs.
Collect all 12 of Trevor's audio logs.
Activate the tower in the Anthropic Hills.
Use a functioning Somnodrome.
Activate the tower in the Western Delta.
Free Prometheus from his chains.
Activate the tower at the Circular Oasis.
Activate the tower at the Verdant Canyon.
Activate the tower on the Southern Coast.
Solve "Switcheroo" without using the "keep connections" option.
Explore New Jerusalem in its entirety.
Finish all three text adventures in the exhibition.
Activate the tower in the Lost Marshes.
Activate the tower in the Flooded Valley.
Work on solving a puzzle for more than 20 minutes.
Activate a Prometheus monument without stopping the spark-chasing music.
Solve one Pandora monument.
Find an ancient human artifact.
Solve one Sphinx monument.
Activate the tower on the Desolate Island.
Solve one Prometheus monument.
Read 30 texts on terminals.
Enter the Megastructure.
Activate the tower in the Eastern Wetlands.
Return to a puzzle for a second attempt.
Discover a trace of what happened on the island.
Activate the tower at the Wooded Plateau.
Read 10 Social Media entries.
Experience a datastream overload.
Talk to each member of your team.
Solve "Loop" without doing multiple circles.
Get involved behind the scenes.
Activate the tower at the Grasslands Ring.
Build one bridge.
Find one Prometheus spark.
Explore content on a lost terminal.
Embark on the expedition.
Tell Purple what to do about his voice.
Explore the Museum of the Simulation in its entirety.
Visit New Jerusalem's Museum of the Simulation.
Tell Schuyler what to do with his life... or not.
Provide your digital signature to someone.
Finish the calibration process.
Maintain the status quo in New Jerusalem... for now.
Help Rand get elected mayor.
Have a heated argument with Thecla.
Refuse to go along on the expedition.